package com.tanhua.sso.service;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.tanhua.sso.config.HuanXinConfig;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Service
public class HuanXinTokenService {

    @Autowired
    private HuanXinConfig huanXinConfig;

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private RedisTemplate<String,String> redisTemplate;

    private static final String tokenRedisKey="HUANXIN_TOKEN";

    //将json数据反序列化
    private static final ObjectMapper MAPPER=new ObjectMapper();


    public String getToken(){

        //先从redis命中
        String cacheData = this.redisTemplate.opsForValue().get(tokenRedisKey);
        if(StringUtils.isNotEmpty(cacheData)){
            return cacheData;
        }

        String url=this.huanXinConfig.getUrl()
                +this.huanXinConfig.getOrgName()+"/"
                +this.huanXinConfig.getAppName()+"/token";

        Map<String,Object> param=new HashMap<>();
        param.put("grant_type","client_credentials");
        param.put("client_id", this.huanXinConfig.getClientId());
        param.put("client_secret",this.huanXinConfig.getClientSecret());
        ResponseEntity<String> responseEntity = this.restTemplate.postForEntity(url, param, String.class);
        if(responseEntity.getStatusCodeValue()!=200){
            return null;
        }

        String body=responseEntity.getBody();

        try {
            JsonNode jsonNode=MAPPER.readTree(body);
            String accessToken = jsonNode.get("access_token").asText();
            //过期时间，提前一天失效
            long expiresIn = jsonNode.get("expires_in").asLong() -86400;

            //将token值存储到redis中
            redisTemplate.opsForValue().set(tokenRedisKey,accessToken,expiresIn, TimeUnit.SECONDS);



        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;


    }

}
